This thesis addresses the role and impact of Geographic Information Systems (GIS) in road traffic management in the Republic of Croatia. A qualitative analysis of the impact of GIS on road traffic safety was conducted. The thesis also includes an examination of the Global Positioning System (GPS) and Galileo system. The work is structured into seven main sections covering theoretical foundations, practical applications, and an analysis of the role of GIS in improving traffic safety and efficiency. The first section introduces GIS as a key technology for managing spatial data, including modeling, spatial analysis, and cartography. Special emphasis is placed on qualitative data processing and the use of various coordinate systems. The third section explores the application of GIS in managing road infrastructure in Croatia. It analyzes the implementation of GIS projects within the road network and highways, including integration with existing traffic systems. The fourth part focuses on the Global Positioning System (GPS) and the Galileo system, providing an overview of their technical characteristics, operational principles, and applications in both civilian and military spheres. The advantages of the Galileo navigation system are also discussed. The fifth section examines the use of GIS in various aspects of traffic management, such as the automation of signaling systems and the creation of orthophoto maps. Applications in traffic infrastructure and road maintenance are described in detail. The sixth section investigates how GIS technology contributes to improving traffic safety through the development of safety diagrams and hazard assessments. It also reviews the role of GIS in reducing infrastructure maintenance costs. The thesis thoroughly elaborates on the historical development of geoinformation systems and their wide-ranging practical applications.